September weather forecast
Petersburg, MI

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Weather in September

September, the first month of the autumn in Petersburg, is also an agreeable month, with an average temperature fluctuating between 55.8°F (13.2°C) and 72.9°F (22.7°C).

Temperature

The beginning of September subtly marks a decrease in the average high-temperature, transitioning from a moderately hot 78.4°F (25.8°C) in August to an agreeable 72.9°F (22.7°C). During the month of September, Petersburg's nighttime temperature lowers to an average of 55.8°F (13.2°C).

Humidity

In September, the average relative humidity is 78%.

Rainfall

In September, the rain falls for 11.7 days. Throughout September, 0.94" (24mm) of precipitation is accumulated. Throughout the year, there are 132.8 rainfall days, and 16.18" (411mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in Petersburg.

Daylight

The average length of the day in September in Petersburg is 12h and 28min.
On the first day of the month, sunrise is at 7:01 am and sunset at 8:07 pm. On the last day of September, sunrise is at 7:31 am and sunset at 7:17 pm EDT.

Sunshine

In September, the average sunshine is 8h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A maximum high UV index of 4 in September translates into the following recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
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Frequently asked questions

What is the temperature in September in Petersburg?

The high-temperature in Petersburg, Michigan, during September is 72.9°F (22.7°C) and the low-temperature is 55.8°F (13.2°C).

What is the average humidity in September in Petersburg?

In September, the average relative humidity in Petersburg, Michigan, is 78%.

How much does it rain in Petersburg in September?

In Petersburg, in September, it is raining for 11.7 days, with typically 0.94" (24mm) of accumulated precipitation.

When it does not snow in Petersburg?

In Petersburg, Michigan, snow does not fall in May through October.

What is the average length of the day in September in Petersburg?

The average day length in September is 12h and 28min.

When is the sunrise / sunset in September in Petersburg?

On the first day of September in Petersburg, Michigan, sunrise is at 7:01 am and sunset at 8:07 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 7:17 pm EDT.

How many hours of sunshine does Petersburg have in September?

In September, the average sunshine duration in Petersburg is 8h.

What is the UV index intensity in September in Petersburg?

In September, the average daily maximum UV index in Petersburg is 4. A UV Index reading of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Petersburg, MI

Average temperature in September - Petersburg, MI
  • Average high temperature in September: 72.9°F

The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in September: 55.8°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).

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Average pressure in September
Petersburg, MI

Average pressure in September - Petersburg, MI
  • Average pressure in September: 30.04"Hg

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Petersburg, MI

Average wind speed in September - Petersburg, MI
  • Average wind speed in September: 7.1mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.3mph).

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Average humidity in September
Petersburg, MI

Average humidity in September - Petersburg, MI
  • Average humidity in September: 78%

The months with the highest relative humidity are January and February (85%).
The month with the lowest relative humidity is October (75%).

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Average rainfall in September
Petersburg, MI

Average rainfall in September - Petersburg, MI
  • Average rainfall in September: 0.94"

The wettest month (with the highest rainfall) is June (2.13").
The driest month (with the least rainfall) is December (0.71").

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Average rainfall days in September
Petersburg, MI

Average rainfall days in September - Petersburg, MI
  • Average rainfall days in September: 11.7 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (5.2 days).

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Average snowfall in September
Petersburg, MI

Average snowfall in September - Petersburg, MI
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.44").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Petersburg, MI

Average snowfall days in September - Petersburg, MI
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Petersburg, MI

Average daylight in September / Average sunshine in September - Petersburg, MI
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in September: 8h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).

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Average sunshine days in September
Petersburg, MI

Average sunshine days in September - Petersburg, MI
  • Average sunshine days in September: 16.1 days

The month with the most sunshine days is October (17.3 days).
The month with the least sunshine days is May (11.4 days).

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Average UV index in September
Petersburg, MI

Average UV index in September - Petersburg, MI
  • Average UV index in September: 4

The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in September
Petersburg, MI

Average cloud cover in September - Petersburg, MI
  • Average cloud cover in September: 35

The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is July (Cloud cover 30).

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Average visibility in September
Petersburg, MI

Average visibility in September - Petersburg, MI
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Petersburg, Michigan, USA

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